Centerless grinding machine for tapering drills and the like



Dec. 14, 1926. 7 1511 135 F. C/SANFORD CENTERLESS GRINDING MACHINE FOR TAFERING' DRILLS AND THE LIKE Filed Nov. 1'7, 1922 2 Sheets-Sheet 1 Dec. 14, 1926.

' F. C. SANFORD CENTERLESS GRINDING MACHiNE FOR TAPERING DRILLS AND THE LIKE .Eiled Nov. 17, 1922 2 Sheets-Sheet IIIIl/Illllllllllll/ W7 -II!!!IIII'IIJIIII'IIWIIIIIII All!!!IIlIIIllIlIlIIIlllI/II/ 5 the grinding wheel movi speed where it contacts with the work lying less grinding ing wheel at proper Patented Dec. 14, 1926.

UNITED STATES PATENT OFFICE.

EBANCIS SANFORD, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE CINCINNATI MILLING MACHINE COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

CENTERLESS GRINDING D IACHINE'FOR TAPERING DRILLSAND THE LIKE.

Application filed November 17, 1922 Serial No. 601,643.

This invention pertains to centerless grinding machines, which may be described as comprising a grinding and a control wheel, and an intermediate work support, ata high surface upon the Work-rest, and the control wheel moving at a relativel opposite direction w ere it makes contact with the opposite side of the work; In its preferred embodiment the centerless grind ing machine employs wheels of true cylindrical form, withtheir peripheral faces oppo:ed and acting directly upon the work lying between their proximate peripheries, though other forms of opposed grinding surfaces are well known in the centerart. posed- "cylindrical grinding and control wheels having their axes adjusted to common plane there is formed between them a throat or passage of progressively narrowing width from a point above or below'the plane of their axes, toward said This narrowing form of throat is plane.

of in the present invention, as will availed later appear, and is hence noted at this point;-

It renders possible, through the use of simple work-supporting and feeding devices, the attainment of the primary object of this invention, which is to produce a simple and efficient machine for grinding bodies or articles to true circular cross section and to tapered form, I

A further object is to provide a machine for tapering drills and the like including a feed slide upon the machine and a rwt for the work or article to be tapered uponthe feed'slide, the feed slide being angularly adjustable with respect to a grinding wheel to be capable of imparting the proper and preferred lift to the article as itis fed forward-.'

ly, and the work rest being angularly adjustable with respect to the grinding wheel and feed slide to cooperate with the feed slide in presenting the article to the grindand preferred angle to accurately obtain the exact taper desired.

A still further object is to provide in a machine of the present character, a feed slide and a work rest adapted to be adiusted angularly and set with respect to each other and with respect to a grinding wheel to be lowspeed and in the With peripherally op capable of cooperating in accurately tapering an article an exact and predetermined amount.

Another object is to provide in a centerless cylindrical grinding machine, an adjustable feed for uniformly lifting an article as it is fed between and past a grinding and a drive wheel, and an adjustable rest associated with the feed for disposing the work or article at proper an le to the axis of the grinding wheel, where b y'the feed and rest can be nicely adjusted to predetermined positions and set to be capable of presenting the article to the grinding wheel in such manner that 1) the forward and rearward, ,or large and small, ends of the article will have the desired diameters at the moment they pass off ofthe grinding wheel; and (2) the peripheral face of the article between its ends will be accurately tapered fromfend to end, of the article. 1

And yet another object is to provide a grinding machine consisting of a grinding and a control wheel arranged opposite each other, the axial lines of said parallel and their working faces being concentric'with their axes, of a vertically, angularly adjustable feed slide for uniformly advancing and lifting an article to be tapered as the article is fed to and past the working faces of said grinding and control wheels to engage said faces in a plane belowthe axes of the grinding and control wheels, and of a vertically, angularly adjustable rest associated with the feed slide for disposing the article at proper angle to the axes of the grinding and control wheels, the adjustable work rest being adapted to cooperate with the feed slide in presenting the article to the grinding wheel in that manner previously ascertained to be most suitable for the particular article to be tapered. A

With the above and other objects in view, the invention comprises the construction, arrangement and combination of parts as now to be fully described and as hereinafter to be specifically claimed, it being understood that the disclosure herein is merely illustrative of the principles of the invention and meant in no way in a limit-ing sense, changes in details rangement of parts being permissible so long wheels being of construction and aras within the scope of the appended claims.

In the accompanying drawing forming a part of this specification.

Fig. 1 is a plan view of a machine disclosing the principles of the invention;

Fig. 2 is a sectional view on line 2-2 in Fig. 1;

Fig. 3 is a perspective view of the feed bracket, feed-slide, and work rest;

Figs. 4 and 5 are diagrammatic views bet= terd disclosing principles of the invention; an

Fig. 6 is a diagrammatic view, ing with the showing of the mode of operation of the work rest is disposed ent from Hm angle of correspond- Fig. 5, suggesting the m c wh at an angle differthe rest of Figs. 1 to 5.

With respect to the drawing and the numorals of reference indicated thereon, 1O denotes the machine frame, 11 a grinding wheel upon a preferably horizontally arranged shaft 12 having a pulley 13 and journaled in a bearing 14 on the frame, and 15 denotes a control wheel arranged o posite the grinding wheel on a parallel s aft 16 having a pulley 17 and mounted in bearings 18, 19 of a control wheel carrier 20 which is desirably longitudinally adjustable on the frame, whereby the control wheel can be adjusted toward and from the grinding wheel, numeral 21 designating, generally, mechanism including a hand wheel for imparting longitudinal movement to the control wheel. g

The working faces of the grinding and control wheels are parallel and may be spaced any suitable distance apart, depending upon the dimensions of'the particular article being tapered. Obviously, the pulleys 13 and 17 are to receive belts for rotating the grinding and control wheels at suitable speeds.

Numeral 22 denotes a carrier for the feed bracket 23 and feed slide 24, this carrier be ing situated between and beneath the grinding and control wheels and being secured to the frame to be longitudinally adjustable thereon, as denoted at 25, whereby the carrier 22 can be moved to its proper working position on the frame beneath the grinding and control wheels.

As discl0sed,,the feed bracket 23 has integral feet or lugs 26 receiving screw bolts 27 securing the feed bracket to the carrier 22, and includes spaced apart and parallel ribs 28, arranged transversely of the frame and parallel with the axes of the grinding and control wheels. A slide support 29, arranged between the ribs 28, is pivoted at the lower portion of its rearward end 30. to the parallel ribs and is provided at its forward end with a threaded opening receiving a lifting screw 31 engaging the bracket 23 whereby the slide support can be arranged to have any preferred inclination or slope.

The feed slide 24 may have a dove tail fit upon the slide support, as denoted at 32, to permit reciprocation thereon, and a work rest 33 may be associated with the feed slide in any manner to be adjustable vertically to have any angle with respect to the feed slide and grinding wheel. As disclosed, the lower portion of the forward end of thework rest is pivoted to the slide as at 34, while the rearward portion t iereof has an opening to receive a screw 35 engaging the "feed slide and having adjusting and locking nuts 36 above and below the opening. The work rest includes a seat 37 for an article A, such as a drill, to be tapered.

Numeral 39 represents a hand piece whereby the feed slide can be actuated to move transversely of the frame, although the feed slide could be manipulated in some other convenient manner.

In the drawings the axes of the two wheels 11 and 15 are shown in the same horizontal plane, and the slide support 29 and work rest 33 are shown as both adjustable in a vertical plane, to that in which the wheel axes lie. If the plane of the axes be other than horizontal, as it may be, the plane of adjustment of the slide support 29 and work rest 33 will be correspondingly shifted from the vertical, or will remain perpendicular to the plane of thewheel axes.

In Fig. 2 the seat 37 is shown horizontally arranged, parallel with the axes of the grinding and control wheels and at considerable distance below said axes. In Figs. 4 and 5 I have diagrammatically disclosed the manner in which a cylindrical article so situated would be tapered as the feed slide advances and lifts to move the article to and beyond the grinding wheel. Up to that point where the article starts to move beyond the wheel, as denoted at a in Figs. 4 and 5, its center line is horizontal, or parallel with the axes of the grinding and control wheels. When the article has been completely removed from the grinding wheel, as at b in Figs. 4 and 5, its center line has shifted vertically to be a trifle below the horizontal, it being understood that the article at b is also beneath the center of the grinding and control wheels.

In Fig. 6 I have diagrammatically disclosed an article to be tapered, as at a, considerably below the axes of the grinding and control wheels, as when arranged on a seat allowing proper engagement of the article with the grindin and control wheels, but out of parallel with the axes of said grinding and control wheels. As the article shown advances andlifts, to the position 1), oil of the grinding wheel and beneath the centers of the grinding and control wheels, the center line moves nearer to the horizontal.

The feed slide and the work rest can be or in a plane at a right angle 1 mounted upon said slide,

angularly adjusted vertically to' have any angular relations with respect to the axes of the grinding and control wheels and with respect to each other to make possible .the production of any tapering result desired. The double adjustment tends toward exactness and accuracy, the angularly adjustable feed slide being more sensitive for the adjustment looking toward the predetermined size of the forward or large end of the artitle being tapered, the angularly adjustable work rest being more sensitive for the adjustment looking toward the predetermined size'of the rearward or small end of the article, and both feed slide and work rest when adjusted cooperating in the machine to ensure the predetermined taper-desired in. the finished article. 7

It will be apparent that the angle of feed and the angle'of the rcst can be adjusted to obtain "any taper, so long as the article being taperedremains below the centers of the grinding and control wheels, the-relative positions of the parts as illustrated and described being merely for the purpose of explanation of the invention.

Having thus fully described the invention, what I claim as new and desire to secure by Letters Patent is:

1. A grinding machine comprising a grind-' ing wheel and a controlwheel arranged in peripheral opposition cent and movable across the peripheral face of the grinding wheel; and a Work rest the work rest and the slide being independently and relatively adjustable to diiferent degrees'of angular.-

' 'ing "across the.

ity in a comon Plane perpendicular to the common plane 0 the wheel axes.

, 2'. In a machine of the 'character described, a grinding Wheel and a. control wheel in peripheral opposition; a feed slide movable peripheral face of the grinding wheel'in a plane perpendicular to the cornmon plane of the. wheel axes,- said slide be adjustable to varying angularity to said plane of the wheel axes; and a work rest mounted upon said slide.

3. lna machine of the character described,

a .feed slide movable across the peripheral face of the grinding plane perpendicular to the com-.

mon plane of the wheel axes, said slide being adjustable to varying angularity ,to said plane of. the wheel axes; and .a work rest mounted uponsaid slide andadjustable'to reference to the slide, and, inthesame plane as the; slide.

4. In a machine of the character described,

. a grinding wheel having each point in its from its axis,

working face arranged at the same distance working face arrangedopposite said grinding wheel, .the axes of 'said wheels 'being a vfeed slide adja-glel to the parallel, a feed slide arrangedbeneath, between and transversely of said wheels, said feed slide being adjustable angularly in aand a Work rest mounted upon said slide and adjustable relatively thereto in the same plane as the slide, to vary its angularity relative to the slide, seat to receive and support the work and to hold' the same aganst independent axial movcment.--

6. In a machine of the character described,- a grinding wheel having a substantially horizontal axis and a working face every point in which is e uidistant from said axis; an inclined feed slide arranged adjacent said Working face of the wheel and movable transversely across the same in a plane paralvertical plane of the wheel axis; and a work rest mounted upon and movable with the slide, said rest being angularly adjustable relatively to the slide, in a vertical plane, and being provided with a Work seat to receive and support the Work and to hold the same against independent axial movement.

7. A machine of the character described, comprising a rinding wheel having a hori-' zontal axis an a working face each point of which .is spaced at the same distance from grinding and. control wheels, said feed slide lying in a. plane. which is perpendicular to the plane offsa'id wheels, and an-adsaid axis,

justable work rest upon said feed slide, said work rest being angularly adjustable in a vertical plane. and ha'vin aworkgseat 1ying in a. plane pe ndicular to the plane of said grinding an said seat can present the-fullflen'gth of an, article being tapered to both of'sa1d' wheels as saidfeed slide advances andflifts.

8. A centerless grinder, comprising a sup-.

and having its upper face inclined relatively control wheels, whereby mate port and provided with a work-rest having a seat to receive the article to be ground, said slide being longitudinally movable, whereby it is adapted to move the article laterally and progressively into the narrowing throat between the grinding and control Wheels and to carry the article progres sively out of contact with the grinding and control surfaces as grinding progresses;

9. A centerless grinder, comprising a support lying in a plane intermediate the proxifaces of the grinding and control wheels, and capable of adjustment to varying relation to the common planeof theaxes of said grinding and control wheels; and a slide engaging and movable upon said support and provided with a work-rest having a seat to receive the article to be ground, said slide being longitudinally movable, whereby it is adapted to' move the article laterally and progressively into the narrowing throat betweenthe grinding and control wheels, and to carry the article progressively out of contact with the grinding and control surfaces as the grinding progresses, the rate of lateral feed being determinable by thedegree of inclination of the slide.

10. A centerless grindencomprising a sup port lying ina plane intermediate the proximate faces of the grinding and control wheels and having its upper face oblique to the common plane of the axes of said grinding and control wheels; a slide engaging and movable upon said support; and a workrest pivotally mounted upon said slide and day of November,

11. A centerless grinder,comprising a support lying in a plane intermediate the proximate faces of the grinding and control wheels and pivoted for adjustment in a plane perpendicular to the common plane of the 'ax'es'of the grinding and control wheels; a slide engaging and movable upon said support; and a worlurest pivot-ally mounted upon said slide and having a seat to receive the article to be ground, the slide and workrest bein longitudinally movable, whereby the article to be ground is moved laterally and progressively into the narrowlng throat between the grinding and control wheels and 'is carried progressively out of contact with the grinding and control surfaces as the grinding progresses, and the adjustment of the pivoted Work-rest serving to determine the degree of taper efiected by the grinding regardless of the inclination of the slide and its support and the consequent rate of lateral'feed of the work.

Signed at Bridgeport, in the county of Fairfield, and State of Connecticut, thisllth FRANCIS G. SANFGRD.

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